nimble/apps/tester: Implement GATT Server BTP Service (ID 0x07)#1969

piotrnarajowski wants to merge 3 commits intoapache:masterapache/mynewt-nimble:masterfrom

piotrnarajowski:GATTS_BTP_SERVICEpiotrnarajowski/mynewt:GATTS_BTP_SERVICECopy head branch name to clipboard